Investigation of Electrochemical Properties of Carbon Nanofibers Prepared by CCVD Method |
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| Authors: | Stela Pruneanu Z Ali G Watson Shun-quin Hu D Lupu A R Biris |
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| Affiliation: | 1. School of Science and Technology , University of Teesside , Middlesbrough, United Kingdom s.pruneanu@tees.ac.uk;3. School of Science and Technology , University of Teesside , Middlesbrough, United Kingdom;4. National Institute of R&5. D for Isotopic and Molecular Technologies , Cluj-Napoca, Romania |
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| Abstract: | Carbon nanofibers, with diameters between 80 and 290 nm and specific area of 242 m2g?1, have been prepared by the catalytic chemical vapor deposition method. After preparation, the powder was mixed with silicon oil in order to create a paste electrode. The electrochemical behavior of this type of electrode was investigated by cyclic voltammetry, using a solution of 10?3 M ferrocenecarboxylic acid as mediator. The redox process is quasi-reversible, and it involves the transfer of electrons between Fe(II) and Fe(III). The same mediator was used for the construction of a second-generation glucose biosensor. The mediator was co-immobilized with the enzyme in the carbon nanofibers paste. The sensor linearly responded to glucose, in the concentration range of 1.7 to 7 mM. A time of around 30 seconds was required to reach 95% of the maximum steady-state current. Also, the oxidation of calf thymus DNA at the carbon nanofiber paste electrode was investigated by differential pulse voltammetry (DPV). A clear signal, due to guanine oxidation, was obtained in the case of single-stranded DNA. |
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| Keywords: | carbon nanofibers DNA oxidation glucose-oxidase |
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